Abstract
This paper presents experimental results on π +π − production threshold from the collision of quasi-real photons. The data, obtained at the e +e − collider DCI, are a combination of the results from the DM1 and DM2 experiments. Using the e +e − and π +π − production for normalization and cross-checks, we observe a pion pair yield at low invariant mass ( W < 500 MeV/ c 2) which is approximately twice the one expected from Born terms.
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